how to calculate the size of sys.stdin?

[Graham Guttocks]

Greetings,

Is there a way to calculate the size (in bytes) of sys.stdin?  I tried
to use the "stat" module to accomplish this, but os.stat() seems to
only accept the name of a file.  (i.e, the following doesn't work):

import os,stat
size = os.stat(sys.stdin.read())[stat.ST_SIZE]

Regards,
Graham

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